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Supplier A : average life= 12.00 years, standard deviation = 0.90 years; n = 14 Supplier B : average life = 13.50 years, standard deviation

Supplier A: average life= 12.00 years, standard deviation = 0.90 years; n = 14

Supplier B: average life = 13.50 years, standard deviation = 1.10 years; n = 12

Assume a normal distribution for both sets of data. We want to test at the .05 significance level.

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